Hyperfine interaction of electrons confined in CsPbI$_3$ nanocrystals with nuclear spin fluctuations

Sergey R. Meliakov; Evgeny A. Zhukov; Vasilii V. Belykh; Kirill V. Kavokin; Mikhail O. Nestoklon; Elena V. Kolobkova; Maria S. Kuznetsova; Manfred Bayer; Dmitri R. Yakovlev

arXiv · 2508.17881

Hyperfine interaction of electrons confined in CsPbI$_3$ nanocrystals with nuclear spin fluctuations

Sergey R. Meliakov·Evgeny A. Zhukov·Vasilii V. Belykh·Kirill V. Kavokin·Mikhail O. Nestoklon·Elena V. Kolobkova·Maria S. Kuznetsova·Manfred Bayer·Dmitri R. Yakovlev

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Abstract

The coherent spin dynamics of electrons are investigated for CsPbI$_3$ perovskite nanocrystals in a glass matrix using time-resolved Faraday ellipticity. In nanocrystals with a diameter of about 11 nm, the Larmor precession frequency has a linear dependence on magnetic field corresponding to the electron Land\'e $g$-factor of 2.07. We find a finite Larmor precession frequency at zero magnetic field, corresponding to the electron spin splitting of $0.8$ $\mu$eV. This splitting is explained by the hyperfine interaction with nuclear spin fluctuations. Our model analysis shows that the hyperfine interaction for the conduction band electrons is contributed both by the $p$-orbitals of the lead atoms and by the $s$-orbitals of the iodine atoms, with the leading contribution to the hyperfine field fluctuations coming from iodine. This fact agrees well with the 9% iodine contribution to the Bloch amplitude of the conduction band, obtained by DFT calculations. From these findings, the atomic hyperfine constant for the $5s$-orbital of iodine is evaluated as 190 $\mu$eV.

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Sergey R. Meliakov, Evgeny A. Zhukov, Vasilii V. Belykh, Kirill V. Kavokin, Mikhail O. Nestoklon, Elena V. Kolobkova, Maria S. Kuznetsova, Manfred Bayer, Dmitri R. Yakovlev. 2025-08-25. Hyperfine interaction of electrons confined in CsPbI$_3$ nanocrystals with nuclear spin fluctuations. https://arxiv.org/abs/2508.17881

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